<select name="c" onchange="SearchCrit();" id="cat" class="search_category">
<?php $categorie = mysql_query("SELECT * FROM categoria");

if (mysql_num_rows($categorie)){
while ($content=mysql_fetch_assoc($categorie)){
?>

<option value="<?php echo $content['id'];?>" ><?php echo $content['descrizione']; ?></option>


<?php }
}?>

</select>